Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
Before regulations were enacted to prevent such practices, information leaked through selective disclosure was incorporated into markets prior to the public release of news. “News days” did not deliver news to markets; now they do. We provide novel evidence of changes in returns and turnover behavior around the enactment of regulations barring selective disclosure practices in the United States and the EU. We conversely document lack of such changes in Australia and Japan, which did not implement similar measures. We conclude that selective disclosure resolves Roll’s R2 puzzle.